linux-kernel - [PATCH net] mvpp2: refactor MTU change code

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Message-Id: <20190725231931.24073-1-mcroce@redhat.com>
Date:   Fri, 26 Jul 2019 01:19:31 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Stefan Chulski <stefanc@...vell.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH net] mvpp2: refactor MTU change code

The MTU change code can call napi_disable() with the device already down,
leading to a deadlock. Also, lot of code is duplicated unnecessarily.

Rework mvpp2_change_mtu() to avoid the deadlock and remove duplicated code.

Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 41 ++++++-------------
 1 file changed, 13 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 2f7286bd203b..60eb98f99571 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -3612,6 +3612,7 @@ static int mvpp2_set_mac_address(struct net_device *dev, void *p)
 static int mvpp2_change_mtu(struct net_device *dev, int mtu)
 {
 	struct mvpp2_port *port = netdev_priv(dev);
+	bool running = netif_running(dev);
 	int err;
 
 	if (!IS_ALIGNED(MVPP2_RX_PKT_SIZE(mtu), 8)) {
@@ -3620,40 +3621,24 @@ static int mvpp2_change_mtu(struct net_device *dev, int mtu)
 		mtu = ALIGN(MVPP2_RX_PKT_SIZE(mtu), 8);
 	}
 
-	if (!netif_running(dev)) {
-		err = mvpp2_bm_update_mtu(dev, mtu);
-		if (!err) {
-			port->pkt_size =  MVPP2_RX_PKT_SIZE(mtu);
-			return 0;
-		}
-
-		/* Reconfigure BM to the original MTU */
-		err = mvpp2_bm_update_mtu(dev, dev->mtu);
-		if (err)
-			goto log_error;
-	}
-
-	mvpp2_stop_dev(port);
+	if (running)
+		mvpp2_stop_dev(port);
 
 	err = mvpp2_bm_update_mtu(dev, mtu);
-	if (!err) {
+	if (err) {
+		netdev_err(dev, "failed to change MTU\n");
+		/* Reconfigure BM to the original MTU */
+		mvpp2_bm_update_mtu(dev, dev->mtu);
+	} else {
 		port->pkt_size =  MVPP2_RX_PKT_SIZE(mtu);
-		goto out_start;
 	}
 
-	/* Reconfigure BM to the original MTU */
-	err = mvpp2_bm_update_mtu(dev, dev->mtu);
-	if (err)
-		goto log_error;
-
-out_start:
-	mvpp2_start_dev(port);
-	mvpp2_egress_enable(port);
-	mvpp2_ingress_enable(port);
+	if (running) {
+		mvpp2_start_dev(port);
+		mvpp2_egress_enable(port);
+		mvpp2_ingress_enable(port);
+	}
 
-	return 0;
-log_error:
-	netdev_err(dev, "failed to change MTU\n");
 	return err;
 }
 
-- 
2.21.0